问：AudiKit：AKEqualizerFilter无法与iBAction一起正常使用

Question

好吧，我真的很困惑，因为当我更改参数并尝试使用iBAction启动（）/ bypass（）一个节点时，什么都没有发生。振荡器（WhiteNoise）似乎正常工作，而均衡器却无法工作。这些参数确实发生了变化，但是声音保持不变。

这是我的代码：

import AudioKit

class Conductor {

    private var oscillator = AKWhiteNoise()
    public var filter = AKEqualizerFilter()

    private var gain = -12.0


    init() {
        oscillator.amplitude = 1
        oscillator.stop()

        filter = AKEqualizerFilter(oscillator)
        filter.bypass()

        AudioKit.output = filter

        do {
            try AudioKit.start()
        } catch {
            AKLog("AudioKit did not start!")
        }
    }

    func play()  {
        if oscillator.isPlaying {
            oscillator.stop()
        } else {
            oscillator.play()

        }
    }

    func bypass(centerFrequency: Double, Q: Double)  {
        if filter.isBypassed {
            filter.rampDuration = 0.3
            filter.centerFrequency = centerFrequency
            filter.bandwidth = centerFrequency/Q
            filter.gain = pow(10, gain/20)

            filter.start()
        } else {
            filter.bypass()
        }
        print(filter.isBypassed)
    }

}

和我在ViewController中的呼叫

@IBAction func bypass(_ sender: Any) {
    conductor.bypass(centerFrequency: 125, Q: 7)
}